[lighttechinteractive] Treasure mania?

Hi all, I can't understand how to play this game, I'm assuming that if I go to 
far either to the right or left, the buzzing is an alarm letting me know that I 
am getting to close to the cliffs? the thing I can't get is how I know when 
there are chests? that's the only thing I don't get. 

thanks.

lelia

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